Somatic Nervous System

• It consists of two types of nerves: Cranial Nerves and Spinal Nerves. There are total 12 pairs of cranial nerves which originate from different brain parts. There are total 31 pairs of spinal nerves which originate from spinal cord. Spinal nerves have two functions. The nerve fibres of spinal nerves collects sensory information from different body parts (except brain) and take it to spinal cord from where sensory information is sent to brain. Spinal nerves also similarly take back the motor decisions of brain to different body parts, muscles and glands.

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Important Points of Human Behavior :- 

1. “Inthis chapter, the relation of human behavior and biology is described.”
2. The cell is the basic unit of human body. Many cells form tissue, many tissue to organ, many organs to organ systems are formed. These organ systems perform specific functions of our body. Nerve cell is the basic and smallest unit of nervous system. It is also called neuron.
3. Nerve cells are of three types on the basis of functions: Sensory, motor and association neurons.
4. Nerve cells perform the function of transmitting information in our body.
5. Nervous system is of two types: Central Nervous System and Peripheral Nervous System.
6. Central Nervous system consists of brain and spinal cord.
7. Peripheral nervous system is divided in two parts somatic nervous system and autonomic nervous system.

Human Behavior Questions and Answers

1. Which part of nerve cell contains nucleus?
A Axon
B. Soma
C. Myelin Sheath
D. Nodes of Ranvier

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2. Which part of nerve cell increases the speed of nerve conduction?
A Myelin Sheath
B. Dendrites
C. Thalamus
D. Pons

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“3. Which part of brain controls activities like eating, drinking, sleeping, temperature regulation and sexual arousal?”
A Pons
B. Cerebellum
C. Hypothalamus
D. Thalamus

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4. How many pairs of cranial nerves are there in human brain?
A. 6
B. 10
C. 12
D. 31

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